You climb at whatever angle gives you the desired speed. You'll have to adjust your angle as you climb to maintain the correct speed.

I feel like this could be awesome but too stupid to understand it. What angle should I set a plane to for this? Gods I struggle Soo much with air and things just don't make sense to me. Oh well I'll just deal with it. Worst player in the game.

Wow, really? I thought it would just be some math equation lol.

I believe they were determined by simple experimentation. Set full throttle (or WEP if appropriate) and then vary your pitch to raise and lower speed until you observe the greatest RoC. IRL values would be available from flight manuals, but would not be reliable in-game since Gaijin changes flight models to make planes fly the way they want them to.

How the heck is this calculated?

American props dont use kilometers :P
but "props" for trying 👍

the F4U-4B has a 3 speed supercharger it's section is inaccurate

This reminds me of one of the first counter-intuitive things you learn in flight school: control speed by changing pitch, control altitude by changing throttle. Of course it's not that simple, but you get the idea. Ignore this principle at your peril. Follow it and you will touch grass. Thanks for assembling the chart. It should be noted that while these speeds yield the maximum climb rate, you will often want to go faster when climbing unless there are no enemies nearby, as this area of your flight envelope will not give good maneuverability, especially in American planes, which are mostly BnZ obligates that suck ass at low speeds. Level your climb in time to gain maneuvering speed, otherwise you will be forced into low energy defensive maneuvering, which is not efficient. <edited to remove misleading terminology>

Thank you. Having all the rates in one table is super convenient.

@Ackarusta Thanks for the advice.